Malicious PDF — malware analysis report

Static analysis result for SHA-256 8663ea6775850bc6…

MALICIOUS

PDF

79.7 KB Created: 2021-09-02 21:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 17227c8f792efe1d1dffeae3f07a0149 SHA-1: 1c1347615ed980c27f6bf66a44b87c5611b15f62 SHA-256: 8663ea6775850bc68f73809f50d86dc9e6da2c3530cf126b746f4c748947e9bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely leveraging T1059.007 (JavaScript) for exploitation or redirection, and T1566.001 (Spearphishing Attachment) as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://krisoc.ru/uplcv?utm_term=java+programming+projects+pdf PDF link annotation
    • http://sro52.ru/uploads/files/debazivowes.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/800447535609b87f40ae3f.pdfIn PDF document text
    • http://turnyras.lt/Files/file/tetuxipuredinepogajakusoz.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160dde3a90dff5---16560524647.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/a79uc2bfvutadlb793lctelhhq/78508325491.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac0470f6df---wojux.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/17069745656.pdfIn PDF document text
    • http://aa-nusd.jp/wafezolawelireve.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/sevezewadaxurorokuxazuda.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/vumobup.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c457f369c18---37693793935.pdfIn PDF document text
    • http://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/97287884759.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/b210b3746140436009b7d025057cad9c/rutaxurejusogekomaji.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/81c406408bd686d5ffd21b15e5e444a6/13376546648.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///dawudomujefegi.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/9e2bdf0065f200ea748cfa2efffc4cae/99024459977.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/24746305660.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608366932cd1b---20489137917.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/1997621137.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/afiimojrvc6r31m6bb4te9bee6/xozemarexefeb.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/38641103663.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/wozogagolafowipupotoxu.pdfIn PDF document text
    • http://classofjoy.com/KK/userfiles/files/16774375286.pdfIn PDF document text
    • https://energooptima.hu/upload/File/2994087412.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A9 17724 bytes
SHA-256: f5c62fa71e4d3c4d54a759cedca7efa706a50006d917195f18dedb976125a682
font_01_sfnt_off0000ff8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8F 11104 bytes
SHA-256: c51202ea4de73b9cad945fa4e6e3e9e57dbf37dd0863e4cca2f5f9f06dc66346
font_02_sfnt_off00011945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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